ACQUIRE: an inexact iteratively reweighted norm approach for TV-based Poisson image restoration

We propose a method, called ACQUIRE, for the solution of constrained optimization problems modeling the restoration of images corrupted by Poisson noise. The objective function is the sum of a generalized Kullback–Leibler divergence term and a TV regularizer, subject to nonnegativity and possibly ot...

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Published inApplied mathematics and computation Vol. 364; p. 124678
Main Authors di Serafino, Daniela, Landi, Germana, Viola, Marco
Format Journal Article
LanguageEnglish
Published Elsevier Inc 01.01.2020
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ISSN0096-3003
1873-5649
DOI10.1016/j.amc.2019.124678

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Abstract We propose a method, called ACQUIRE, for the solution of constrained optimization problems modeling the restoration of images corrupted by Poisson noise. The objective function is the sum of a generalized Kullback–Leibler divergence term and a TV regularizer, subject to nonnegativity and possibly other constraints, such as flux conservation. ACQUIRE is a line-search method that considers a smoothed version of TV, based on a Huber-like function, and computes the search directions by minimizing quadratic approximations of the problem, built by exploiting some second-order information. A classical second-order Taylor approximation is used for the Kullback–Leibler term and an iteratively reweighted norm approach for the smoothed TV term. We prove that the sequence generated by the method has a subsequence converging to a minimizer of the smoothed problem and any limit point is a minimizer. Furthermore, if the problem is strictly convex, the whole sequence is convergent. We note that convergence is achieved without requiring the exact minimization of the quadratic subproblems; low accuracy in this minimization can be used in practice, as shown by numerical results. Experiments on reference test problems show that our method is competitive with well-established methods for TV-based Poisson image restoration, in terms of both computational efficiency and image quality.
AbstractList We propose a method, called ACQUIRE, for the solution of constrained optimization problems modeling the restoration of images corrupted by Poisson noise. The objective function is the sum of a generalized Kullback–Leibler divergence term and a TV regularizer, subject to nonnegativity and possibly other constraints, such as flux conservation. ACQUIRE is a line-search method that considers a smoothed version of TV, based on a Huber-like function, and computes the search directions by minimizing quadratic approximations of the problem, built by exploiting some second-order information. A classical second-order Taylor approximation is used for the Kullback–Leibler term and an iteratively reweighted norm approach for the smoothed TV term. We prove that the sequence generated by the method has a subsequence converging to a minimizer of the smoothed problem and any limit point is a minimizer. Furthermore, if the problem is strictly convex, the whole sequence is convergent. We note that convergence is achieved without requiring the exact minimization of the quadratic subproblems; low accuracy in this minimization can be used in practice, as shown by numerical results. Experiments on reference test problems show that our method is competitive with well-established methods for TV-based Poisson image restoration, in terms of both computational efficiency and image quality.
ArticleNumber 124678
Author Landi, Germana
di Serafino, Daniela
Viola, Marco
Author_xml – sequence: 1
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  email: daniela.diserafino@unicampania.it
  organization: Dipartimento di Matematica e Fisica, Università degli Studi della Campania “Luigi Vanvitelli”, viale A. Lincoln 5, Caserta 81100, Italy
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  givenname: Germana
  surname: Landi
  fullname: Landi, Germana
  email: germana.landi@unibo.it
  organization: Dipartimento di Matematica, Università degli Studi di Bologna, Piazza di Porta S. Donato 5, Bologna 40126, Italy
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  givenname: Marco
  orcidid: 0000-0002-2140-8094
  surname: Viola
  fullname: Viola, Marco
  email: marco.viola@uniroma1.it
  organization: Dipartimento di Ingegneria Informatica, Automatica e Gestionale “Antonio Ruberti”, Sapienza Università di Roma, via Ariosto 25, Roma 00185, Italy
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Keywords Iteratively reweighted norm approach
Quadratic approximation
Image restoration
Poisson noise
TV regularization
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Snippet We propose a method, called ACQUIRE, for the solution of constrained optimization problems modeling the restoration of images corrupted by Poisson noise. The...
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StartPage 124678
SubjectTerms Image restoration
Iteratively reweighted norm approach
Poisson noise
Quadratic approximation
TV regularization
Title ACQUIRE: an inexact iteratively reweighted norm approach for TV-based Poisson image restoration
URI https://dx.doi.org/10.1016/j.amc.2019.124678
Volume 364
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